Step 4:
In System Settings go to Shortcuts and Gestures->Global Keyboard Shortcuts. Select KOSD from the components list and reassign your keys as needed.

That's it. Enjoy!

P.S.: Don't like monochrome icons? Then create the file .kde4/share/config/kosd_keysrc. Put the lines

[General]
UseSvg=0

in it and restart the KOSD Keys service.

You can also set the mixer control by adding the line

MixerControl=name

where name is the name of your desired control (e.g. Master, PCM, ...).

Changelog:

Changelog from 0.8.0 to 0.8.1
* Fixed some power management issues

Changelog from 0.7.1 to 0.8.0
* Added standard methods for battery, brightness and volume, allowing the pixmaps to be kept in memory, which avoids hard disk reads and makes the OSD more responsive

Changelog from 0.7.0 to 0.7.1
* Fixed a possible crash, if no mixer control named "Master" exists

Changelog from 0.6.2 to 0.7.0
* Changed KOSD Keys Service to use ALSA directly instead of relying on KMix

Changelog from 0.6.1 to 0.6.2
* Fixed CMakeLists.txt not to link against libsolidcontrol which is no longer used

Changelog from 0.6.0 to 0.6.1
* Made KOSD Keys Service compatible with KDE SC 4.6

Changelog from 0.5.1 to 0.6.0
* Added support for (Plasma-themed) SVG icons
* Many improvements throughout the code

Changelog from 0.5.0 to 0.5.1
* Fixed the mixer to always use the correct master channel

Changelog from 0.4.2 to 0.5.0
* Split up the monolithic application into a KDED module for the OSD, a KDED module for the key listener, a system settings module and a simple access library allowing any application to use the OSD
* Replaced the old OSD by new, fully Plasma based OSDs. There's now a "standard" OSD similar to the old one and a "compact" OSD similar to the OSDs provided by KMix and Powerdevil

How do you like Plasma 5? The best KDE Desktop ever. Definitely a nice improvement. Not decided yet. Haven't tried it yet. I do not like some of the changes. KDE is taking the wrong way. I am still sticking with KDE 3.5. I have no opinion, but wanted to vote anyway.

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